Accessibility upgrade of chart()-function

[serkor1]

This is the first step towards an accessibility upgrade of {cryptoQuotes}. In this PR the following emergency patch has been implemented on the chart()-function:

• The chart()-function now has a new option which controls the overall width of the chart.

Note

During the next couple of updates all documentation has to use correct alt text to increase accessibility of {cryptoQuotes}.

[serkor1]

The change in the chart()-function can be summarized as follows,

library(cryptoQuotes)

# default chart
chart(
  ticker = BTC,
  indicator = list(
    sma()
  ),
  sub    = list(
    macd()
  )
)

# with increased width
chart(
  ticker = BTC,
  indicator = list(
    sma()
  ),
  sub    = list(
    macd()
  ),
  options = list(
    width = 2
  ) 
)

^{Created on 2024-08-16 with reprex v2.1.0}